US20080047526A1 - Conduit Arrangement in a Control Valve Module for a Fuel Injector Assembly - Google Patents
Conduit Arrangement in a Control Valve Module for a Fuel Injector Assembly Download PDFInfo
- Publication number
- US20080047526A1 US20080047526A1 US10/595,028 US59502803A US2008047526A1 US 20080047526 A1 US20080047526 A1 US 20080047526A1 US 59502803 A US59502803 A US 59502803A US 2008047526 A1 US2008047526 A1 US 2008047526A1
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- US
- United States
- Prior art keywords
- control valve
- valve module
- pressure passage
- pump body
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims description 9
- 238000003754 machining Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 9
- 238000004891 communication Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/22—Fuel-injection apparatus with bimetallic or memory shape alloy elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
Definitions
- the invention relates to fuel injector assemblies for internal combustion engines, and more particularly to the arrangement of conduits within fuel injector assemblies.
- FIG. 1 A fuel injector assembly of well-known design, including a fuel injection pump and a control valve self-contained in a unit, is illustrated in FIG. 1 .
- the fuel injector assembly 10 comprises a pump module 12 , a control valve module 14 , a spring cage assembly 16 , a nozzle assembly 18 , and a nozzle nut 20 .
- the pump module 12 comprises a pump body 22 with a central pumping cylinder 24 that receives a plunger 26 .
- the cylinder 24 and the plunger 26 define a high-pressure cavity 28 .
- the plunger 26 reciprocates within the cylinder 24 to increase fuel pressure in the high-pressure cavity 28 . This action distributes pressurized fuel into a high-pressure passage 30 that exits at a face 31 in a large recess 33 , formed in a lower end of the pump body 22 .
- the high-pressure passage 30 communicates with a high-pressure passage 32 in the control valve module 14 because an upper portion of the control valve module 14 is received within the large recess 33 so that an upper edge 34 of the control valve module 14 abuts the face 31 of the large recess.
- the face 31 requires a precision grinding process to insure the necessary flatness for a metal-to-metal seal.
- the high-pressure passage 32 extends generally linearly from the upper edge 34 to a lower edge 35 of the control valve module 14 .
- a stator assembly 36 is centered within a recess 38 at the upper edge 34 .
- a control valve 40 extends from the stator assembly 36 within a cylindrical chamber 42 , and reciprocates in response to the respective forces of the stator assembly 36 and a spring 44 .
- a high-pressure annulus 46 surrounding the control valve 40 is in communication with the high-pressure passage 32 by way of a cross passage 62 .
- At least one low-pressure passage or spill bore 48 extends from the cylindrical chamber 42 to a side edge of the control valve module 14 and communicates with a low-pressure reservoir 50 between the nozzle nut 20 and the control valve module 14 .
- the control valve 40 blocks communication between the high-pressure passage 32 and the low-pressure passage 48 .
- the control valve 40 permits communication between the high-pressure passage 32 and the low-pressure passage 48 .
- a high-pressure passage 52 in the spring cage assembly 16 communicates at one end with the high-pressure passage 32 and at the other end with a high-pressure passage 54 in a stop plate 56 .
- the high-pressure passage 54 connects with a passage 58 in the nozzle assembly 18 .
- the nozzle nut 20 threadably attaches to the pump body 22 at a junction 60 and secures the nozzle assembly 18 , stop plate 56 , spring cage assembly 16 , and control valve module 14 to the pump body 22 . It has been found that the junction 60 is a point where fractures can occur because the axial flange forming the large recess 33 is a point of weakness.
- the high-pressure annulus 46 and the high-pressure passage 32 in the control valve module 14 are formed by drilling, followed by at least two electrochemical machining (ECM) procedures.
- ECM electrochemical machining
- the primary function of using an ECM process is to smooth sharp edges and burrs resulting from drilling or machining, thereby strengthening the control valve module.
- the cross passage 62 is drilled through the control valve module 14 to a T-connection with the high-pressure passage 32 .
- a first ECM process at the T-connection has the effect of slightly enlarging the T-connection.
- a second ECM process is also used to form the high-pressure annulus 46 .
- a plug or pin 64 (typically made of a shape memory alloy) is disposed in the cross passage 62 between the high-pressure annulus 46 and the edge of the control valve module 14 . Also, the requirement for centering the stator assembly 36 in the recess 38 and the necessary for flatness in the metal-to-metal seal with the face 31 requires a precision grinding operation to maintain critical tolerances.
- the fuel injector assembly is the type having a pump body with a high-pressure passage and a spring cage assembly with a high-pressure passage.
- the control valve module is adapted to be interposed between the pump body, with an upper edge facing the pump body and a lower edge facing the spring cage assembly.
- the control valve module further has a recess to accommodate at least a portion of a stator assembly with a cylindrical chamber extending into the valve module. An annulus surrounds the cylindrical chamber, and the control valve module has a high-pressure passage.
- control valve high-pressure passage has a first portion extending linearly between the annulus and the upper edge where it is positioned to communicate with the pump body high-pressure passage, and a second portion extending linearly between the annulus and the lower edge where it is positioned to communicate with the spring cage assembly high-pressure passage.
- the first portion and second portion extend relative to each other at an angle other than 180 degrees.
- the pump body can be provided with a facing recess with clearance to accommodate at least a portion of the stator assembly so that the recess and the facing recess fully enclose and retain the stator assembly when the control valve module is assembled to the pump body.
- a fuel injector assembly for an internal combustion engine comprises a pump body with a high-pressure passage, a spring cage assembly with a high-pressure passage, and a control valve module between the pump body and the spring cage assembly.
- the control valve module has an upper edge facing the pump body and a lower edge facing the spring cage assembly, and a recess to accommodate at least a portion of a stator assembly with a cylindrical chamber extending into the valve module.
- An annulus surrounds the cylindrical chamber.
- a high-pressure passage is characterized by a first portion extending linearly between the annulus and the upper edge where it is positioned to communicate with the pump body high-pressure passage, and a second portion extending linearly between the annulus and the lower edge where it is positioned to communicate with the spring cage assembly high-pressure passage.
- the pump body can have a facing recess with clearance to accommodate at least a portion of the stator assembly so that the recess and the facing recess fully enclose and retain the stator assembly.
- the first portion and the second portion preferably extend relative to each other at an angle other than 180 degrees.
- a method of making a control valve module for a fuel injector assembly for an internal combustion engine comprises the steps of:
- FIG. 1 is a cross-sectional view of a fuel injector assembly in the prior art.
- FIG. 2 is a cross-sectional view of a fuel injector assembly incorporating the present invention.
- FIG. 2 it can be seen that the overall relative arrangement of conventional components in the fuel injector assembly of FIG. 1 remains. Consequently like components will bear like reference numerals to those of FIG. 1 .
- a conduit arrangement 100 in the control valve module 14 ′ is new.
- the interface between the pump body 22 ′ and the control valve module 14 ′ is new.
- the large recess 33 in which the control valve module 14 is received in the fuel injector assembly of the prior art is eliminated.
- a smaller recess 102 is provided in the pump body 22 ′ with clearance to accommodate enclosing a portion of the stator assembly 36 .
- a facing recess 104 in the upper edge 34 ′ of the control valve module 14 ′ cooperates with the recess 102 to completely enclose the stator assembly 36 .
- a high-pressure annulus 106 surrounds and is in communication with the cylindrical chamber 42 containing the control valve 40 .
- a high-pressure passage 108 comprises a first portion 110 extending linearly between the upper edge 34 ′, where it communicates with the high-pressure passage 30 in the pump body 22 ′, and the high-pressure annulus 106 .
- the high-pressure passage 108 also comprises a second portion 112 extending linearly between the high-pressure annulus 106 and the lower edge 35 ′ of the control valve module 14 ′, where it communicates with the high-pressure passage 52 in the spring cage assembly 16 .
- Formation of the conduit arrangement 100 can be accomplished by drilling at an oblique angle from the upper edge 34 ′ to a point where the high-pressure annulus 106 is to be formed at an intersection with the cylindrical chamber 42 , and also drilling at an oblique angle from the lower edge 35 ′ to the same point. Applying a single ECM process at the intersection will form the high-pressure annulus 106 .
- the conduit arrangement 100 according to the invention enables a simpler and less costly manufacturing process. It eliminates the need for drilling and reaming a close tolerance cross passage, and then plugging the passage. It also eliminates one ECM process. It further eliminates a precision grinding process, otherwise required in the large recess 33 . It has been found that with a new conduit arrangement 100 according to the invention, hydraulic performance is improved, strength of the junction of the nozzle nut with the pump body is increased, and electrical connections to the stator assembly can be made more easily and securely during assembly.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A control valve module (14′) for a fuel injector assembly (10) has a conduit arrangement where a high-pressure passage (108) has a first portion (110) extending linearly between an annulus (106) surrounding the control valve cylinder (42) and an upper edge (34), and a second portion (112) extending linearly between the annulus (106) and a lower edge (35′).
Description
- 1. Field of the Invention
- The invention relates to fuel injector assemblies for internal combustion engines, and more particularly to the arrangement of conduits within fuel injector assemblies.
- 2. Description of the Related Art
- A fuel injector assembly of well-known design, including a fuel injection pump and a control valve self-contained in a unit, is illustrated in
FIG. 1 . The fuel injector assembly 10 comprises apump module 12, acontrol valve module 14, aspring cage assembly 16, anozzle assembly 18, and anozzle nut 20. - The
pump module 12 comprises apump body 22 with acentral pumping cylinder 24 that receives aplunger 26. Thecylinder 24 and theplunger 26 define a high-pressure cavity 28. In a well-known manner, theplunger 26 reciprocates within thecylinder 24 to increase fuel pressure in the high-pressure cavity 28. This action distributes pressurized fuel into a high-pressure passage 30 that exits at aface 31 in alarge recess 33, formed in a lower end of thepump body 22. - The high-
pressure passage 30 communicates with a high-pressure passage 32 in thecontrol valve module 14 because an upper portion of thecontrol valve module 14 is received within thelarge recess 33 so that anupper edge 34 of thecontrol valve module 14 abuts theface 31 of the large recess. Theface 31 requires a precision grinding process to insure the necessary flatness for a metal-to-metal seal. The high-pressure passage 32 extends generally linearly from theupper edge 34 to alower edge 35 of thecontrol valve module 14. Astator assembly 36 is centered within arecess 38 at theupper edge 34. Acontrol valve 40 extends from thestator assembly 36 within acylindrical chamber 42, and reciprocates in response to the respective forces of thestator assembly 36 and aspring 44. A high-pressure annulus 46 surrounding thecontrol valve 40 is in communication with the high-pressure passage 32 by way of across passage 62. - At least one low-pressure passage or
spill bore 48 extends from thecylindrical chamber 42 to a side edge of thecontrol valve module 14 and communicates with a low-pressure reservoir 50 between thenozzle nut 20 and thecontrol valve module 14. In a closed position, thecontrol valve 40 blocks communication between the high-pressure passage 32 and the low-pressure passage 48. In an open position, thecontrol valve 40 permits communication between the high-pressure passage 32 and the low-pressure passage 48. - A high-
pressure passage 52 in thespring cage assembly 16 communicates at one end with the high-pressure passage 32 and at the other end with a high-pressure passage 54 in astop plate 56. The high-pressure passage 54, in turn, connects with apassage 58 in thenozzle assembly 18. The nozzle nut 20 threadably attaches to thepump body 22 at ajunction 60 and secures thenozzle assembly 18,stop plate 56,spring cage assembly 16, andcontrol valve module 14 to thepump body 22. It has been found that thejunction 60 is a point where fractures can occur because the axial flange forming thelarge recess 33 is a point of weakness. - In the present design, the high-
pressure annulus 46 and the high-pressure passage 32 in thecontrol valve module 14 are formed by drilling, followed by at least two electrochemical machining (ECM) procedures. The primary function of using an ECM process is to smooth sharp edges and burrs resulting from drilling or machining, thereby strengthening the control valve module. Thecross passage 62 is drilled through thecontrol valve module 14 to a T-connection with the high-pressure passage 32. A first ECM process at the T-connection has the effect of slightly enlarging the T-connection. A second ECM process is also used to form the high-pressure annulus 46. Thereafter, a plug or pin 64 (typically made of a shape memory alloy) is disposed in thecross passage 62 between the high-pressure annulus 46 and the edge of thecontrol valve module 14. Also, the requirement for centering thestator assembly 36 in therecess 38 and the necessary for flatness in the metal-to-metal seal with theface 31 requires a precision grinding operation to maintain critical tolerances. - These processes are costly and time-consuming. There is a need to improve the ease and to lower the cost of manufacture, as well as to continually improve the performance of the control valve module during injection events.
- These problems and others are solved by the present invention of a control valve module for a fuel injector assembly for an internal combustion engine. The fuel injector assembly is the type having a pump body with a high-pressure passage and a spring cage assembly with a high-pressure passage. The control valve module is adapted to be interposed between the pump body, with an upper edge facing the pump body and a lower edge facing the spring cage assembly. The control valve module further has a recess to accommodate at least a portion of a stator assembly with a cylindrical chamber extending into the valve module. An annulus surrounds the cylindrical chamber, and the control valve module has a high-pressure passage. According to the invention, the control valve high-pressure passage has a first portion extending linearly between the annulus and the upper edge where it is positioned to communicate with the pump body high-pressure passage, and a second portion extending linearly between the annulus and the lower edge where it is positioned to communicate with the spring cage assembly high-pressure passage.
- Preferably, the first portion and second portion extend relative to each other at an angle other than 180 degrees. Also, the pump body can be provided with a facing recess with clearance to accommodate at least a portion of the stator assembly so that the recess and the facing recess fully enclose and retain the stator assembly when the control valve module is assembled to the pump body.
- In another aspect of the invention, a fuel injector assembly for an internal combustion engine comprises a pump body with a high-pressure passage, a spring cage assembly with a high-pressure passage, and a control valve module between the pump body and the spring cage assembly. The control valve module has an upper edge facing the pump body and a lower edge facing the spring cage assembly, and a recess to accommodate at least a portion of a stator assembly with a cylindrical chamber extending into the valve module. An annulus surrounds the cylindrical chamber. A high-pressure passage is characterized by a first portion extending linearly between the annulus and the upper edge where it is positioned to communicate with the pump body high-pressure passage, and a second portion extending linearly between the annulus and the lower edge where it is positioned to communicate with the spring cage assembly high-pressure passage.
- The pump body can have a facing recess with clearance to accommodate at least a portion of the stator assembly so that the recess and the facing recess fully enclose and retain the stator assembly. Moreover, the first portion and the second portion preferably extend relative to each other at an angle other than 180 degrees.
- In a further aspect of the invention, a method of making a control valve module for a fuel injector assembly for an internal combustion engine comprises the steps of:
- providing a metal block with a machined upper edge and machined lower edge;
- machining a recess into the upper edge with a cylindrical chamber extending therefrom;
- drilling a first portion of a conduit from the upper edge to an intersection point at the cylindrical chamber;
- drilling a second portion of a conduit from the lower edge to the intersection point; and
- electro chemically machining an annulus surrounding the cylindrical chamber at the intersection point.
- In the drawings:
-
FIG. 1 is a cross-sectional view of a fuel injector assembly in the prior art. -
FIG. 2 is a cross-sectional view of a fuel injector assembly incorporating the present invention. - Looking now more closely at
FIG. 2 , it can be seen that the overall relative arrangement of conventional components in the fuel injector assembly ofFIG. 1 remains. Consequently like components will bear like reference numerals to those ofFIG. 1 . Turning now to the invention, it will be apparent that aconduit arrangement 100 in thecontrol valve module 14′ is new. Moreover, the interface between thepump body 22′ and thecontrol valve module 14′ is new. Thelarge recess 33 in which thecontrol valve module 14 is received in the fuel injector assembly of the prior art is eliminated. Asmaller recess 102 is provided in thepump body 22′ with clearance to accommodate enclosing a portion of thestator assembly 36. A facingrecess 104 in theupper edge 34′ of thecontrol valve module 14′ cooperates with therecess 102 to completely enclose thestator assembly 36. A high-pressure annulus 106 surrounds and is in communication with thecylindrical chamber 42 containing thecontrol valve 40. A high-pressure passage 108 comprises afirst portion 110 extending linearly between theupper edge 34′, where it communicates with the high-pressure passage 30 in thepump body 22′, and the high-pressure annulus 106. The high-pressure passage 108 also comprises asecond portion 112 extending linearly between the high-pressure annulus 106 and thelower edge 35′ of thecontrol valve module 14′, where it communicates with the high-pressure passage 52 in thespring cage assembly 16. - Manufacture of the pump body and the control valve module are simpler because of the invention. Conventional machining processes can form the facing
recess 104 and thecylindrical chamber 42, as well as theupper edge 34′. Precision machining is unnecessary because therecess 102 and facingrecess 104 are adequate to center thestator assembly 36. Conventional machining and grinding are adequate to obtain the necessary tolerances for theupper edge 34′ on thecontrol valve module 14′. - Formation of the
conduit arrangement 100 can be accomplished by drilling at an oblique angle from theupper edge 34′ to a point where the high-pressure annulus 106 is to be formed at an intersection with thecylindrical chamber 42, and also drilling at an oblique angle from thelower edge 35′ to the same point. Applying a single ECM process at the intersection will form the high-pressure annulus 106. - It can be seen that the
conduit arrangement 100 according to the invention enables a simpler and less costly manufacturing process. It eliminates the need for drilling and reaming a close tolerance cross passage, and then plugging the passage. It also eliminates one ECM process. It further eliminates a precision grinding process, otherwise required in thelarge recess 33. It has been found that with anew conduit arrangement 100 according to the invention, hydraulic performance is improved, strength of the junction of the nozzle nut with the pump body is increased, and electrical connections to the stator assembly can be made more easily and securely during assembly. - While the invention has been specifically described in connection with certain specific embodiments thereof, it is to be understood that this is by way of illustration and not of limitation, and the scope of the appended claims should be construed as broadly as the prior art will permit.
Claims (7)
1. A control valve module for a fuel injector assembly for an internal combustion engine, the fuel injector assembly having a pump body with a high-pressure passage and a spring cage assembly with a high-pressure passage, wherein the control valve module is adapted to be interposed between the pump body, with an upper edge facing the pump body and a lower edge facing the spring cage assembly, and wherein the control valve module further has a facing recess to accommodate at least a portion of a stator assembly with a cylindrical chamber extending into the valve module from the facing recess, with an annulus surrounding the cylindrical chamber, and with a high-pressure passage, characterized by:
the control valve high-pressure passage having a first portion extending linearly between the annulus and the upper edge where it is positioned to communicate with the pump body high-pressure passage, and a second portion extending linearly between the annulus and the lower edge where it is positioned to communicate with the spring cage assembly high-pressure passage.
2. A control valve module according to claim 1 wherein the first portion and second portion extend relative to each other at an angle other than 180 degrees.
3. A control valve module according to claim 1 wherein the pump body is provided with a recess to accommodate at least portion of the stator assembly so that the recess and the facing recess fully enclose and retain the stator assembly when the control valve module is assembled to the pump body.
4. A fuel injector assembly for an internal combustion engine, the fuel injector assembly having a pump body with a high-pressure passage, a spring cage assembly with a high-pressure passage, and a control valve module between the pump body and the spring cage assembly, with an upper edge facing the pump body and a lower edge facing the spring cage assembly, and wherein the control valve module has a facing recess to accommodate at least a portion of a stator assembly with a cylindrical chamber extending into the valve module from the facing recess, with an annulus surrounding the cylindrical chamber, and with a high-pressure passageway, characterized by:
the control valve high-pressure passage having a first portion extending linearly between the annulus and the upper edge where it is positioned to communicate with the pump body high-pressure passage, and a second portion extending linearly between the annulus and the lower edge where it is positioned to communicate with the spring cage assembly high-pressure passage.
5. A fuel injector assembly according to claim 4 wherein the pump body has a recess to accommodate at least portion of the stator assembly so that the recess and the facing recess fully enclose and retain the stator assembly.
6. A fuel injector assembly according to claim 4 wherein the first portion and second portion extend relative to each other at an angle other than 180 degrees.
7. A method of making a control valve module for a fuel injector assembly for an internal combustion engine comprising the steps of:
providing a metal block with a machined upper edge and machined lower edge;
machining a facing recess into the upper edge with a cylindrical chamber extending therefrom;
drilling a first portion of a conduit from the upper edge to an intersection point at the cylindrical chamber;
drilling a second portion of a conduit from the lower edge to the intersection point; and electro chemically machining an annulus surrounding the cylindrical chamber at the intersection point.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2003/020641 WO2005010346A1 (en) | 2003-06-30 | 2003-06-30 | Conduit arrangement in a control valve module for a fuel injector assembly |
Publications (2)
Publication Number | Publication Date |
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US20080047526A1 true US20080047526A1 (en) | 2008-02-28 |
US7448362B2 US7448362B2 (en) | 2008-11-11 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/595,028 Expired - Fee Related US7448362B2 (en) | 2003-06-30 | 2003-06-30 | Conduit arrangement in a control valve module for a fuel injector assembly |
Country Status (5)
Country | Link |
---|---|
US (1) | US7448362B2 (en) |
AU (1) | AU2003258975A1 (en) |
DE (1) | DE10394260T5 (en) |
GB (1) | GB2417292B (en) |
WO (1) | WO2005010346A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD934299S1 (en) | 2020-01-29 | 2021-10-26 | Caterpillar Inc. | Injector |
USD934298S1 (en) | 2020-01-29 | 2021-10-26 | Caterpillar Inc. | Injector |
DE102020117001A1 (en) | 2020-06-29 | 2021-12-30 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Injection device of an internal combustion engine and method for operating an internal combustion engine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6059203A (en) * | 1998-09-03 | 2000-05-09 | Caterpillar Inc. | Valve assembly with concentrically linked components and fuel injector using same |
US6196199B1 (en) * | 1999-12-28 | 2001-03-06 | Detroit Diesel Corporation | Fuel injector assembly having an improved solenoid operated check valve |
US20030111049A1 (en) * | 2001-12-18 | 2003-06-19 | Lewis Stephen R. | Measuring check motion through pressure sensing |
US20030127532A1 (en) * | 2001-12-17 | 2003-07-10 | Coldren Dana R. | Electronically-controlled fuel injector |
US20040021008A1 (en) * | 2002-07-30 | 2004-02-05 | Diesel Technology Company | Fuel injector for diesel engines |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07117012B2 (en) * | 1986-09-05 | 1995-12-18 | トヨタ自動車株式会社 | Unit Injector |
US6565020B1 (en) * | 2002-07-16 | 2003-05-20 | Detroit Diesel Technology | Electromagnetic actuator and stator design in a fuel injector assembly |
-
2003
- 2003-06-30 DE DE10394260T patent/DE10394260T5/en not_active Withdrawn
- 2003-06-30 GB GB0525167A patent/GB2417292B/en not_active Expired - Fee Related
- 2003-06-30 WO PCT/US2003/020641 patent/WO2005010346A1/en active Application Filing
- 2003-06-30 AU AU2003258975A patent/AU2003258975A1/en not_active Abandoned
- 2003-06-30 US US10/595,028 patent/US7448362B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6059203A (en) * | 1998-09-03 | 2000-05-09 | Caterpillar Inc. | Valve assembly with concentrically linked components and fuel injector using same |
US6196199B1 (en) * | 1999-12-28 | 2001-03-06 | Detroit Diesel Corporation | Fuel injector assembly having an improved solenoid operated check valve |
US20030127532A1 (en) * | 2001-12-17 | 2003-07-10 | Coldren Dana R. | Electronically-controlled fuel injector |
US20030111049A1 (en) * | 2001-12-18 | 2003-06-19 | Lewis Stephen R. | Measuring check motion through pressure sensing |
US20040021008A1 (en) * | 2002-07-30 | 2004-02-05 | Diesel Technology Company | Fuel injector for diesel engines |
US6758415B2 (en) * | 2002-07-30 | 2004-07-06 | Robert Bosch Gmbh | Fuel injector for diesel engines |
Also Published As
Publication number | Publication date |
---|---|
AU2003258975A1 (en) | 2005-02-14 |
WO2005010346A1 (en) | 2005-02-03 |
DE10394260T5 (en) | 2006-05-24 |
GB2417292A (en) | 2006-02-22 |
US7448362B2 (en) | 2008-11-11 |
GB2417292B (en) | 2006-08-09 |
GB0525167D0 (en) | 2006-01-18 |
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Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SEELBACH, KLAUS;REEL/FRAME:017579/0629 Effective date: 20060306 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20121111 |